package com.heima.kafka.sample;

import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.apache.logging.log4j.message.StringFormattedMessage;

import java.time.Duration;
import java.util.Collections;
import java.util.Properties;

/**
 * @Description: test
 * @Create by: JJ菜菜
 * @Date: 2022/1/9 21:28
 */
public class ConsumerQuickStart {

    public static void main(String[] args) {
        // 1. 添加kafka的配置信息
        Properties properties = new Properties();
        //  kafka的连接地址
        properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "192.168.200.130:9092");
        //消费者组
        properties.put(ConsumerConfig.GROUP_ID_CONFIG, "group2");
        //消息的反序列化器
        properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
        properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");

        // 2. 消费者对象
        KafkaConsumer<String, String> consumer = new KafkaConsumer<>(properties);
        // 3. 订阅主题
        consumer.subscribe(Collections.singletonList("itheima-topic"));

        // 当前线程一直处于监听状态
        while (true){
            // 获取消息
            ConsumerRecords<String, String> consumerRecords = consumer.poll(Duration.ofMillis(1000));
            for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {
                System.out.println(consumerRecord.key());
                System.out.println(consumerRecord.value());
            }
        }
    }
}
